Edit: Issue tracker now here https://issuetracker.unity3d.com/is...r-a-few-seconds-with-scanning-for-usb-devices I've submitted a bug report about this (case 1349380) but QA doesn't see this is as a bug so reporting here for awareness. Basically what happens now on 2021.2 is that if you happened to install Android module along with the engine version you use, every project - regardless if it targets android or not - will get stalled on every project load for ~4 seconds for scanning USB devices by Android Extension. This can sometimes happen even when the editor has loaded the project - despite you never needing this on a Windows project for example. I do wonder why this isn't seen as an issue because it's a clear regression, this didn't happen on 2020.3. Blank 3D project loads in 6 seconds on my rig using 2020.3 and 2021.2 takes 10 seconds to load because of the extra time taken by Android Extension. Of course those few extra seconds are not that long but it gets old quickly + it really annoys you when it happens while doing other things inside the editor. Only way to counter this is to just simply not install Android support for the editor version you are using for your Windows etc projects..